High-speed steel composite roller and production method thereof

Abstract

The invention discloses a high-speed steel composite roller and a production method thereof. The high-speed steel composite roller comprises a roller shell and a mandrel, wherein the roller shell is composed of a high-speed steel layer and a plain carbon steel layer located in the high-speed steel layer in a composite mode, and the mandrel is made of forged steel. The assembling faces of the roller shell and the mandrel are in conical fit with the ratio of 40:1, and the assembling end of the mandrel and the matching face of the roller shell are locked through four to six countersunk bolts used as keys. According to the roller shell, part of high-speed steel is replaced by plain carbon steel, and the production cost of the roller is greatly lowered while the strength and abrasion resistance of the roller shell are guaranteed; the mandrel and the roller shell are detachably connected and can be repeatedly used, so that the production cost of the roller is further lowered; and the mandrel is made of the forged steel instead of nodular cast iron, the strength of the mandrel is improved, and the service life of the roller is prolonged.

Description

technical field [0001] The invention relates to a roll and a production method thereof, in particular to a high-speed steel composite roll and a production method thereof, and belongs to the technical field of roll manufacturing for steel rolling. Background technique [0002] The roll is an important part consumed in large quantities in the steel rolling production. The quality of the roll not only affects the surface quality of the rolled material, but also affects the operating rate of the rolling mill, which directly restricts the economic benefits of the enterprise. [0003] In the existing cold-rolled strip steel production process, the cold-rolled strip steel backup roll usually adopts forged steel rolls such as 9Cr2Mo or integrally forged high-speed steel rolls. Destructive damage such as cracks and spalling on the roll surface has a great impact on the economic benefits of the entire industry; the main reasons for these problems are the low alloy content of the work...

AI Technical Summary

Problems solved by technology

[0002] The roll is an important part consumed in large quantities in steel rolling production. The quality of the roll not only affects the surface quality of the rolled material, but also affects the operating rate of the rolling mill, which directly restricts the economic benefits of the enterprise.

[0003] In the existing cold-rolled strip steel production process, the cold-rolled strip steel backup roll usually adopts forged steel rolls such as 9Cr2Mo or integrally forged high-speed steel rolls. Destructive damage such as cracks and spalling on the roll surface has a great impact on the economic benefits of the entire industry; the main reasons for these problems are the low alloy content of the working layer materials of the existing backup rolls, the coarse matrix structure, and the low contact fatigue resistance , Poor toughness, under the repeated alternating action of the strong rolling pressure of the rolling mill and the reverse bending force of the work roll during use, the fatigue stress and shear stress on the roll surface exceed the strength limit of the material, resulting in cracks, peeling, etc. destructive damage

Although the patent: "A High-alloy Centrifugal Composite Cast Steel Backup Roll and Its Manufacturing Method" described in ZL2009 1 0001054.9 is feasible for the selection of roll working layer materials in hot-rolled strip rolling, however, the invention technology The disadvantage is that the tensile strength of the core of the roll is low, and the roll is prone to breakage during the use of cold-rolled strip steel.

High-speed steel is used in roll production due to its high hardness, high wear resistance and high heat resistance, but the cost of integrally forging high-speed steel is very high, which reduces the market competitiveness of the product; and the composite cast high-speed steel roll core Most of them are made of ductile iron. The strength of ductile iron is low, and it is easy to break the roll during use, which cannot meet the requirements of large reduction of the supporting frame of the cold rolling strip mill.

[0004] At the same time, the outer layer and the core of the roll are integrated into a whole through metallurgical compounding. The roll must be scrapped as a whole after many times of grinding, and then replaced with a new roll for operation, resulting in a large waste of roll manufacturing materials.

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